A computer from the mid-20th century would fill an entire room -a big room, at that! IBM introduced the 305 RAMAC system in 1956, the first computer to use a hard drive. What you see here is that hard drive, which weighed a ton and held a whopping 5 megabytes of memory storage. It was named the 350 Disk Storage Unit. At the time, you could lease the entire computer setup for a mere $3,200 a month! Link -via Bits and Pieces